Machine for boring pistons



NOV. 18, ARP

MACHINE FOR BORING PISTONS Filed Nov. 12, 1948 5 Sheets-Sheet 1 /N VE NTOR EWALD A. A/PP 5Y Hi3 A TZ'O/FWE) Nov. 18; 1952 ARP 2,618,178

MACHINE FOR BORING PISTONS Filed Nov. 12, 1948 5 Sheets-Sheet 2M/I/E'NTOIP [WALD A/PP 8) 1! A TTORNEY Nov. 18, 1952 E. ARP

MACHINE FOR BORING PISTONS 5 Sheets-Sheet 3 Filed Nov. 12, 1948 Fleuf)/A/l f/V7'0/P [WA/.0 A. /PP amp-Haw A TTO/PNE'Y Nov. 18, 1952 E A2,618,178

MACHINE FOR BORING PISTONS Filed Nov. 12, 1948 5 Sheets-Sheet 4 FIG. 5

lA/VE'NTOR [WALD A, APP

BY/v- MW A TTOENE) Nov. 18, 1952 E. A ARP MACHINE FOR BORING PISTONS 5SheetsSheet 5 Filed NOV. 12, 1948 INVENTOR [WALD A. APP

NI W M y B H M m A Patented Nov. 18, 1952 MACHINE FOR BORING PISTONSEwald A, All Minneapolis, Minn, assignor to Tobin-Arp ManufacturingCompany, Minneapolis, Minn, a corporation of Minnesota ApplicationNovember 12, 1948, Serial No. 59,728

21 Claims.

1 This invention has relation to a machine which has been devised to beespecially useful'for boring the bearings of pistons, etc.

An object of the invention is to provide a machine for boring bearings;and particularly the bearings of pistons and articles or devices of likenature, which will be of novel and improved construction and designed toperform its intended service in novel and improved manner.

A further object is to provide a bearing boring machine wherein will beincorporated various desirable and improved features and characteristicsnovel both as individual entities of the machine and in combination witheach other.

A further object is to provide a machine of the present character whichwill incorporate a novel and improved construction and arrangement forcentering and alining with respect to each other bearings of articles,such as pistons, 'etc., to be bored and a boring bar with appropriatetool for operating on said bearings.

And a further object is to provide in the machineadjustable clampingunits for supporting articles or devices bearings of which are to bebored which will be of simple, practical, efiicient, novel and improvedconstruction.

With the above objects in view, as well as others which will appear asthe specification proceeds, the invention comprises the construction,arrangement and combination of parts as no'w t'o be fully describedand'as hereinafter to be specifically claimed, it being understood thatthe disclosure herein is merely illustrative and intended in no way in alimiting sense, changes in details of construction and arrangement ofparts being permissible as long as within the spirit of the inventionand the scope of the claims which follow.

In the accompanying drawings forming a part of this specification,

Fig. l is a top plan view of a machine made according to the invention;

Fig,'2 is an enlarged fragmentary vertical sectional view, takensubstantially on line 2-4 in Fig. 1, detailing features at an upperportion of the machine and disclosing an adjustable clamping unit ofsaid machine partially in section and partially broken away Fig. 3 is anenlarged fragmentary vertical sectional view, taken substantially online 33 in Fig. l, detailing additional features at an upper portion ofthe machine;

Fig. 4 is an enlarged fragmentary vertical sectional view, taken on line4.4 in Fig. 1;

Fig. 5 is an enlarged fragmentary vertical sectional view, partially inelevation and partially broken away, and with parts omitted, of anadjustable clamping unit and associated parts of said machine'theportions of the view which are in elevation being shown as they wouldappear from the position of line 44 in Fig. 1;

Fig, 6 is a fragmentary vertical sectional view, taken substantially online 66 in Fig. '1, detailing features at a lower portion of themachine;

'Fig. '7 is a. detail sectional view of parts at the right lower side ofthe disclosure of Fig. 6;

Fig. 8' is a detail sectional view of parts at the left lower side ofthedisclosure of said Fig. 6, and

Fig. 9 is a detail sectional view taken as on line 94 in Fig. 2.

The machine of the present invention has been set up on a frame alsosupporting mechanism, denoted A at the left in Fig. 1 of the drawings,forming no part of the invention which this application presents. Inpractical operation, the machine including the mechanism. A and themachine herein illustrated and described have features in common in thatthey receive pressure fluid from a common source, are mounted upon acommon frame work and are capable of being employedin connection withboring bar supporting units, disclosed at the right in said Fig. 1 andhereinafter described, also adapted tobe mounted upon the common frameWork. Stated otherwise, the frame It of the machine of the inventionadditionally supports mechanism A of a machine for accomplishingoperations different from those herein set forth but capable ofpractical utilization On the same frame work in connection with devicesor elements which are commcn to both' machines. Said frame II] isconstituted as a rectilinear slab of rigid material, and can besupported in any suitable and convenient manner, as, for example, aspart of a table, desirably so that the rectilinear slab will behorizontally disposed.

Spaced apart, parallel boring bar supporting units, indicated Hand l2,respectively are situated upon the flat upper surface [3 of the frame itfor slidably adjustable movement in direction toward and away from eachother, and said supportingunits H and I2 include self-alim'ng bearings,represented l4 and [5, respectively, which can be of construction asdisclosedin my pending application. Serial No, 44,442, for Self-AliningBearing, filed August 16, 1948, adapted to be situated in alinedrelation in a single, desirably horizontal, plane to be capable ofselectively receiving a locating rod or mandrel l6, as in Fig. 1, or aboring bar with cutting tool (not shown). The

supporting units I I and I2 are keyed to the frame I3, as at I35, forslight rocking movement in a horizontal plane and fixed against movementin longitudinal direction.

The boring bar supporting unit II is constitituted as an elongatedrectilinear member disposed in perpendicular relation to th frame II],as well as in perpendicular relation to a locating rod or mandrel, suchas IE, or to a boring bar with cutting tool, when situated in theselfalining bearings I4 and I5. A flat lower surface I! of said boringbar supporting unit II rests upon the flat upper surface I3 of saidframe III for slidable movement thereover toward and away from theboring bar supporting unit '12, a and lower portions of the boring barsupporting unit II are cut away to provide spaced apart slots I8,contiguous with said flat lower surface I! and parallel to a locatingrod or mandrel or to a boring bar when in said self-alining bearings I4and I5, including upwardly facing shoulders I9 for a purpose'to be madeplain. Additionally, an upper portion of the boring bar supporting unitII includes spaced apart, horizontally disposed, longitudinallyextending T'- slots 20, contiguous with a fiat interior surface 2| ofsaid boring bar supporting unit II and perpendicular to a locating rodor mandrel or a. boring bar when in the self-alining bearings I4 and I5,as well as parallel with the frame I0, providing exteriorly facingshoulders 22 also for a purpose to be set forth. The fiat interiorsurface 2I likewise is perpendicular to a locating rod or mandrel or aboring bar when in said self-alining bearings I4 and I and to said frameI0.

The boring bar supporting unit I2 is constituted as an elongatedrectilinear member disposed in perpendicular relation to the frame III,

portingunit 12 are cut away to provide spaced apart slots 24, contiguouswith said flat lower surface 23 and parallel to a locating rod ormandrel, or to a boring bar, when in said selfi allning bearings I4 andI5, which contain supporting rollers 25 resting upon said fiat uppersurface I3 for rolling or sliding movement of the boring bar supportingunit I2 toward and away from the, boring bar supporting unit Ii.

Also an upper portion of the boring bar supporting unit I2 includesspaced apart, horizontally disposed, longitudinally extending T-slots26, contiguous with a fiat interior surface 2'! of said boring barsupporting unit I2 and perpendicular to a locating rod or mandrel or aboring bar when in the self-alining bearings I4 and I5, as well asparallel with the frame I9, providing exterior-1y facing shoulders 23for the same purpose as are the exteriorly facing shoulders 22. The fiatinterior surface 2! is disposed in parallel relation to the flatinterior surface 2 I.

The machine incorporates a pair of duplicate adjustable clamping units,each represented 29,

and each clamping unit includes a clamping member 30.

, The'clamping members 38 are disposed in spaced, parallelrelation toeach other between and in perpendicular relation to the boring barsupporting units II and I2, and each clamping out interior 34.

member is constituted as a housing which is of flat configuration indirection longitudinally of said boring bar supporting units andcurvilinear at its upper portion and rectilinear at its lower portion.More explicitly stated, each clamping member or housing 30 includes aflat interior surface 3I, oppositely disposed, parallel, lower roundedside surfaces 32, 32, a curvilinear upper side and top surface 33,and ahollowed The flat interior surface 3| is in perpendicular relation tothe frame Ill and to the boring bar supporting units I I and I2, therounded side surfaces 32, 32 are in substantially parallel relation tothe fiat interior surfaces 2I and 21 of said boring bar supportingunits, and said rounded side surfaces 32, 32 are provided by'spacedapart, parallel side walls 35, 35, at the opposite ends f the hollowedout interior 34, in the instance of each clamping member or housing 33.

Each clamping member or housing 33 is assembled with end portions of theboring bar supporting units through the instrumentalityof horizontallydisposed locking elements, represented 36 and 31, respectively, formovement of said clamping members or housings longitudinally of saidboring bar supporting units, toward and away from each other. Th lockingelements 33 and 3! of each clamping member are in alined relation andare disposed in the hollowed out interior 34 of the correspondingclamping member in perpendicular relation to its oppositely disposedside walls 35, 33. More explicitly stated, each locking element 36 hasits outer end portion snugly, slidably mounted inanopening through theside wall 35 of the corresponding housing adjacent the supporting unit II and its inner end portion snugly, slidably. mounted in the adjacentend portion-of an opening through a fitting 33 rigid with saidcorresponding housingdisposed at the midlength of its hollowed outinterior, and each locking element 3'! has its outer end portion snugly,slidably mounted in an opening through the side wall 35 of thecorresponding housing adjacent the supporting unit I2 and its inner endportion snugly, slidably mounted in the adjacent end portion of saidopening through the fitting 3B. The inner end portions of the lockingelements 36- and 31 are hollow, and a compression "coil spring 39 insaid inner end portions, between cross pins 30, 40 rigidwith saidlocking elements,

normally urges the locking elements apart. A neck ill with head 32 rigidwith the outer end of each locking element 36 lies in the T-slot 20 atthe corresponding end of the supporting unit II, a neck 43 with head 44rigid with the outer end of each locking element 3'! lies in the T-slot26 at the corresponding end of the supporting unit I2, said necks-4| and43 with heads constitute means mounting each clamping member upon thesupporting units for movement along their longitudinally extending Tslots, and the compression coil springs 39 normally retain the lockingelements in position to permit the clamping members to be freelyslidable along said supporting units toward and away from each other.

Each clamping member 38 suitably and conveniently supports a roller 33at the midlength of its lower portion whichrests upon the flat uppersurface I 3 of the frame Is in perpendicular relation to thecorresponding clamping member and in parallel relation to the supporting units II and i2, and each clamping memher 3.0. also suitably andconveniently supports mechanism, situated within its hollowed outinterior 314;, for causing th locking elements and 3:1 to be actuatedto. cause, the. corresponding clampingmember and the supporting units H:and I2 to, be gripped together, with the flat androunded surfaces 2|, 32and 21, 32, respectively, engaged, thus to cause the clamping members;and said supporting units to be locked together as a. unitary structure.

A horizontal cylinder 45 rigid with each clamping member or housing so,situated in its hollowed out interior 34. directly above and in spacedrelation to its fitting 38, slidably supports spaced apart. pistons 41,4.1 in its opposite end portions. A space within each cylinder 46, be,

tween the corresponding pistons 47, 41, is denoted 48, and a portleading to said space 48 is indicated 49.. Each piston 41 supports aneck 50, and packing surrounding the neck and em 'g-aged against. thebody of the corresponding piston, as v well as against the interiorsurface of th corresponding cylinder 46, is represented 51. Fluidunder-pressure, applied in a manner to be set. forth, within the spaces48 of the cylinders; 45 is adapted to cause the pistons 41, 41 to beforcibly moved apart, and said pistons will be free for movement towardeach other upon relief of the fiuid under pressure.

The outer ends of the pistons 41, 47 are engaged against the upper endsof longer arms 52, 5.2 of vertical actuating levers 53, 53 in theinstance of each clamping member 30, intermediate portions of saidvertical actuating levers are pivotally supported, as at 54, upon thecorresponding clamping member, and lower end portions of shorter arms55, 55 of the vertical actuating levers are engaged against surfaces ofthe cross pins 40, of said corresponding clamping member which areopposite the compression coil spring 39. The construction andarrangement are such that the pistons 41, 41 will cause the longer arms52, 52 of the actuating levers 5.1, 53 to be moved apart with movementapart of said pistons in response to application of fluid under pressureto the spaces 48 of the cylinders 46, thus to cause the shorter arms 55,55 of said actuating levers and the locking elements 36, 31 to be movedtoward each other, against resilient action of the compression coilsprings 39,

said cylinders to cause the locking elements and shorter arms of theactuating levers to be moved apart and said heads 42 and 44 to bereleased from said shoulders 22 and 28.

The boring bar supporting unit II is adapted to be locked down againstthe flat upper surface (3 of the frame [0, thus to anchor 'said clamp.-ing members and supporting units to said frame, through theinstrumentalityof vertically disposed locking elements 56 slidablymounted, as at 51, in the frame Ill. locking element 56 is disposedabove the flat upsur-face I3 of said frame I!) in a slot [8, and acompression coil spring 58, upon each locking element 5 6 between acollar 59 thereon and said vflat upper surface l3, normally urges thecorresponding locking element 56 upwardly A neck with head 6| rigid withthe upper end of each locking element 56 lies in the .slot 18 at thecorresponding end of the supporting unit H with said head GI above andsaid neck The upper end portion .of each 6 0 t n upwa y fa in sho lders1/ 21? s id supp rt n u t l n id. ompres ion oil; springs 58 normallyretain the locking elements 56, in position to permit the supportingunitH to be released from the flat upper surface 13 of the frame ID.

A vertical cylinder 52, in surrounding relation to the lower end portionof each vertically disposed locking element and rigid with the lowersurface of the frame H3, slidably supports a piston 63 fixed, as at 64,upon said vertically dis-. posed locking element. A space within eachcylinder 52, above the corresponding piston 63, is denoted 65, and aport leading to said space 5,5 is represented 66. Each piston 63supports a neck 6i, and packing surrounding the neclg; and engagedagainst the body of the corresponding piston, as well as against theinterior surface of the corresponding cylinder 62, is represented 68.Fluid under pressure, applied through a flexible hose 69, within thespaces 55 0f the. cylinders 62 is adapted to cause the pistons 53v tobe. forcibly moved downwardly, and said pistons will be free for upwardmovement upon relief of the, fluid under pressure. The construction andarrange-.-. ment are such that the heads 6| will be moved downwardlywith downward. movement of the pistons 53, against resilient action ofthe com-. pression coil springs 58, to be grasped against the shouldersI9, and said compression coil springs 58 will react upon relief ofpressure in said cylinders c2 to cause the heads (ii of the lockingele..-.

Inents to be released from said shoulders I5.

Each adjustable clamping unit 29, includes a pushrod $8, of constructionand assembled with the clamping member 38 of the correspondingadjustable clamping unit in a manner to be. de... scribed, and anoperating lever H, of cons-truce tion and assembled with the frame itand the pushrod id of the corresponding adjustable clamping unit in avmanner also to be described. The pushrod ll] of each adjustable clampingunit. is assembled with the clamping member 39, is disposed centrally ofthe flat interior surface 3! and extends exteriorly of said clampingmember in perpendicular relation thereto, as well as in parallelrelation to the frame l5, and the operating levers H of the adjustableclamping units 29, 29 are disposed at opposite sides of said frame. Moreexplicitly stated, intermediate portions of said operating levers ii arepivotally mounted, as at 72, upon opposite side portions of the frame itfor swinging movement of the operating levers in a vertical planeparallel with the supporting units .II and i2 and perpendicular to theclamping members 35, 35, upper arms 13 of said operating levers extendupwardly from the pivotal sup.- pcrts 32., and lower arms l4 of theoperating levers extend downwardly from said pivotal sup: ports. Iheupper end portions of the upper arms 5'3 are rotatably assembled withthe pushrods ID in a manner to be made clear. The lowerends of the lowerarms it are adapted to be forcibly moved apart, in response toapplication of fluid under pressure, to cause the clamping members 30 tobe forcibly moved toward each other, and moved toward each other, uponrelief of pressure, to allow said clamping members to be moved apart.

Mechanism for forcibly moving the lower arms 74, M of the operatinglevers vll apart includes a horizontal cylinder below the frame ifl'andpivotaliy connected, as at with the lower end of one of the lower arms'14, the one at the right in Figs. 6 and 7, and a horizontal connectingrod IT-alined with the horizontal cylinder :15 and pivotally connected,as at '18, with the'lower end of the other of said lower arms 14, theone at the left in Figs. 6' and 8. More explicitly stated, thehorizontal cylinder I5 is closed at its outer end by a cap member 19supporting spaced apart ears 80 to which the lower end of the lower armIt at the same side of the frame I!) is pivotally connected, and saidhorizontal cylinder is closed at its inner end by a cap member 8! whichincludes an annular opening 82 in which a sleeve 85 is rigidlysup-ported. Said sleeve 83 extends inwardly from the cap member 8| inspaced surrounding relation to the connecting rod 17, and the outer endof the sleeve is closed by a head 80 through which said connecting rodsnugly passes and is slidably arranged. One end portion of theconnecting rod H is rigidly secured, as at85, to a piston 86 slidablyarranged in the horizontal cylinder 15, and a port Bl contiguous with aspace 88'of said horizontal cylinder 15 at the side of the piston 89opposite said connecting rod fl is for application of fluid underpressure to said space. The piston 86 supports a neck 69, and packingsurrounding the neck and engaged against the body of the piston, as wellas against the interior surface of the cylinder i5, is indicated 90. Theother end portion of the connecting rod I1 adjustably supports, as at9i, an attachment piece 92, and said attachment piece is pivotallyconnected to the lower end of the lower arm 74 at the corresponding sideof said frame I0. A compression coil spring 93, on the connecting rod l!and in the cylinder ":5 and the sleeve 83, has one of its ends engagedagainst the piston 86 and its other end engaged against the head 84normally to urge said connecting rod inwardly of said cylinder thus tourge the lower arms I4, 14 of the operating levers II, TI toward and theupper arms :3, I3 of said operating levers away from each other. it willbe apparent that fluid under pressure applied to the space 38 of thecylinder 15 will cause the piston 86 and the connecting rod I? to bemoved outwardly of said cylinder thus to cause the lower arms M of theoperating levers II to be moved away from each other and the upper arms73 of said operating levers to be moved toward each other, and that thecompression coil spring 93 will cause said piston and connecting rod tobe moved inwardly of the cylinder upon relief of pressure thus to causesaid lower arms it! to be moved toward each other and said upper arms I3to be moved away from each other.

Each pushrod I0 includes an external thread 94, and an actuator nut 95is adjustably situated upon each external thread 94. Each actuator nut,95 is of cylindrical configuration and each pushrod I0 passestransversely through the midlength of its corresponding actuator nut insuch manner that the actuator nuts can be disposed with theirlongitudinal axes in a horizontal plane.

The upper end portion of the upper arm I3 of each operating lever II isout awayto provide spaced apart, upwardly opening concavities 96 alinedin direction .parallelly of the clamping members 30, adapted selectivelyto receive a corresponding pushrod I0, and inwardly of said concavitiessaid upper end portion of each upper arm I3 provides a downwardly andinwardly extending curvilinear surface 91 and a horizontal surface 98against and upon which the corresponding actuator nut 95 is adapted torest, as disclosed in Figs. 1 and 2 of the. drawings.

The obvious purpose of the severalv different alined concavitles is forsetting pushrods Such as I0, 10 closer to or farther from the boring barsupporting unit II, depending upon the size of a piston or other deviceor article the bear- .ing of which is to be bored. With adjustment ofsaid pushrods 10, I0 relative to said supporting unit II, the supportingunit I2 will be ad justed to correspond, closer to or farther from thesupporting unit II, as the case may be.

Concavities 96 in the upper arms I3of operating levers H at oppositesides, respectively, of the frame I0 are in alinement in directiontransversely of said frame and .parallelly of the supporting units IIand I2, andothe construc tion and arrangement will be such that whensaid upper arms I3 are forcibly moved toward each other, the pushrods I0and the clamping members 30, 30 also will be forcibly moved toward eachother in direction longitudinally of said pushrods, through theinstrumentality of the upper end portions of the operating levers 'IIand the actuator nuts 95. The construction and arrangement also will besuch that when the lower arms 1-4 of the operating levers II are movedtoward each other to cause the upper arms I3 of said operating levers tobe moved apart, the pushrods and said clamping members will be free tohave movement in direction away from each other.

The outer end of each pushrod I0 supports an actuator piece 99. Verticalplates I00 upon the interior surfaces of the upper arms 13, I3 of theoperating levers TI include upper extensions IOI, each havingconcavities I02 alined withconcav ities 96, for precluding outwardswinging movement of said upper arms to position clear of the actuatornuts 95. The .pushrods I0 lie in the ooncavities I02, and the upperextensions IOI preclude removal of said actuator nuts 95 off of thehorizontal surfaces 98 with outward swinging movement of said upper armsI3, 13. Instead, said upper extensions IOI will engage the actuator nuts95 with outward swinging movement of the upper arms 13, I3 and cause thepushrods I0 and the clamping members 30 to be moved away from eachother.

"Rubber skirts se'curedto the vertical plates I00 and overlapping theopposite side marginal edge portions of the frame I0 are denoted I03.The end portion of each pushrod 10 opposite the actuator piece 99includes a reduced cylind-rical portion I04 situated within the clampingmember 30 of the correspondingclamping unit 29 and fixedly supporting aninterior collar I05 engaged against an annular shoulder I06- of thepushrod. An external surface I01'of each interior collar I05 is ofconical configuration and tapers in direction from the correspondingclamping member toward the corresponding pushrod. An exterior colla I08is fixed, as at I09, to a cylindrical internal surface of thecorresponding clamping member bounding a chamber I I0 which saidcorresponding clamping member provides. An internal surface III of eachexterior collar I08 is of conical configuration and tapers in directionfrom the corresponding clamping member toward the corresponding pushrod,and the external surface I 01 of each interior collar m5 is slidablyfitted against "the internal surface III of each exterior collar I08. Alook plate II2 engages the exterior collar I00 and a retainer plate II3, secured "against the ad acent surface of the corresponding clampingmember as at H4, secures each lock plate in its 9 intended position. Theconstruction and arrangement are such that the interio collar I05 oneach pushrod I will rock in the corresponding exterior collar I08 in ahorizontal plane but will be fixed in said corresponding exterior collaragainst rocking movement in a vertical plane.

Each p-ushrod I0 is hollow, as indicated at H5, and a connector I I6 forfiuid under pressure pens to the hollow interior or each pushrod,denoted at III.

A stub end H8 in each chamber H0 is rigidly fitted, as at II9, into theadjacent open end oi the corresponding pus'hrod I0, and a port I20,contiguous with the interior of said corresponding pushrod, through eachstub end, is open, as at I2I, to an external surface of the stub end inremote relation to the corresponding pushrod.

Each chamber I I0 houses a clamping plug I22 which is fixed in thecorresponding clamping member 30 and is disposed in spaced, adjacentrelation to the end of the corresponding stub end H8 opposite thecorresponding pushrod I0. A rounded closure wall I23 of eachclamping'plug I22 protrudes beyond the flat interior surface 3| of thecorresponding clamping'member 30, and the body of each clamping plug ishollow and is fitted, as denoted at I24, in said corresponding clampingmember in spaced, surrounding relation to the corresponding stub end H8and pushrod I9. A compression coil spring I25, within each chamber I I 0upon the corresponding stub end and pushrod, has one of its ends engagedagainst the corresponding interior collar I and its other end engagedagainst the corresponding clamping plug I22 normally to urge saidinterior collar inwardly of the corresponding clamping member 30. Aninternal annular shoulder I26 of each clamping member 30 is engaged byan external annular shoulder I21 upon the corresponding clamping plugI22, and each compression coil spring l normally retains thecorresponding interior collar I05 seated in its corresponding exteriorcollar I09, with the outer part of the corresponding stub end H8 inspaced, adjacent relation to the corresponding clamping plug, asdisclosed in Fig. 2 of the drawings. A port I28 in each clamping plugI22 affords passage for fluid under pressure from the port I2I of thecorresponding clamping unit to the port 49 leading to the correspondingchamber 48. Packing about each stub end H8 and engaged with an internalsurface of the corresponding clamping plug I22 provides a compartmentI30 within said corresponding clamping plug surrounding thecorresponding stub end I I8 and isolates the ports I2I and I28 from thecorresponding chamber I I0.

In the accomplishment of practical operation of the machine, the boringbar supporting units I I and I2 will be set up on the frame I0 in spacedrelation to each other a distance apart slightly greater than, orapproximately equal to, the distance apart of the rounded side surfaces32, 32 of each clamping member 30, and the supporting unit II will befastened down on the frame I0 in the manneras hereinbefore set forth. Adevice or article a bearing of which is to be rebored, such as a pistonI35, disclosed in Fig. 1 of the drawings,

will be placed between said supporting units, and a locating rod ormandrel, such as I6, will be inserted in and through the self -a'liningbearing I4, said device, article or piston and the self-alining bearingI 5, as in said. Fig. 1. Thereafter, the clamping units 29 will beactuated to cause the clamping members 30 to grasp oppositely dis posedsurfaces of the device, article or piston.

Supposing the device or article a bearing of which is to be rebored tobe a piston, said piston will be situated so that its longitudinal axisis disposed in a plane parallel to the frame I0 with the closed end ofthe piston adjacent one of the clampingmembers 30and the open end ofsaid piston adjacent the other of said clamping members 30, and with thepiston so situated, fluid under pressure will be applied to the space 88of the horizontal cylinder I5. The lower arms I4, I4 of the operatinglevers l I, II will be forcibly moved away from each other in responseto application of pressure fluid to said space 88 thus to cause 'theupper arms I3, I3 of said operating levers, and hence the pushr'ods 10,I0 and the clamping'members 30, 30, to be forcibly moved toward eachother. The flat interior surface 3| of the clamping member 30 which theopen end of the piston is adjacent will engage said open end, and therounded interior surface of the closure wall I23 which the closed end ofthe piston is adjacent will engage a central portion of said closed end.

The exterior collars I08 will engage the interior collars I05 in suchmanner as to retain the clamping members 30 fixed in a vertical planebut free to rock ina horizontal plane while the clamping plugs I22 andthe fiat interior surfaces 3| become engaged with oppositely disposedsurfaces of a device or article such as the piston I35. Upon applicationof force to the clamping members 30, tending to move one of the clampingplugs and one of the clamping members, inward movement of said clampingmembers will be arrested by the device, article or piston. Instead, thepushrods 10 with stub ends II8 move in-' wardly of the clamping members30, against resilient action of the compression coil springs I25, untilsaid stub ends are engaged against the clamping plugs I22 and theinterior collars I05 are released from the exterior collars I08 andsituated at the side thereof adjacent said clamping plugs. Theconstruction and arrangement are such that when said interior collarsare released from said exterior collars, the clamping plugs I22 and theclamping members 30 will be supported upon annular shoulders of the studends II8 just inwardly of the packings I29 for universal rockingmovement. Upon the application of force to the clamping members 30 andthe clamping plugs I22 causing them to be pressed against a device,article or piston, said clamping members will be capable of rocking inuniversal direction relative to said device, article or' piston with theresult that the clamping members and clamping plugs will exert retainingpressure against opposed surfaces of the device, article or piston indirection longitudinally thereof and apply no force tending to impartrocking move I The merit to said device, article or piston. clampingmembers 30 will be held substantially vertical by cooperation of theinterior and exteri'o'r collars I05 and I08 when engaged and the annularshoulders disposed inwardly of the packings I29. The compression coilsprings I25 will be of sufiicient strength to level the work, such as apiston, tobe bored. As will be apparent from Fig. 9, the internalsurfaces III will be in clearing relation to the external surfaces I07at their opposite sides and engaged with said external surfaces at theirtops and bottoms when,

the internal and external collars I05 and I08 are in engagement so thatthe clamping; members 30 can rock in a horizontal plane relative to thework or piston. At the same" time, said internal" and external collarscooperate to maintain the clamping members in vertical position whilethe work or piston rocks in a vertical plane, about the locating rod ormandrel I 6, relative to said clamping members. When the pushrods I movethe clamping members into engagement with a piston, the piston isrotated on its locating rod or mandrel to become engaged either by afiat interior surface 3I or :a rounded closure wall I23, as the case maybe. Upon removal of the interior collars I05 from the exterior collarsI08, the lannular shoulders disposed inwardly of the packings I29maintain the clamping plugs I22, and hence the clamping members 30,snugly supported upon the stub ends II8 but permit said stub ends toslide within said clampin plugs. The outer portions of the stub ends aresomewhat rounded, and the construction and. arrangement asillustratedand. described is provision for universal rocking movement of theclamping members when the interior and exterior collars I05 and I08 aredisengaged. Thus, said clamping members are adapted to take their finalalinement from the piston.

It will be apparent that the clamping members and clamping plugs will beactuated in response to fluid under pressure to cause the opposite endsof devices orarticles to be rebored :to be engaged with equal pressureand so that there will be no distorting pressure applied to the locatingelementor rod.

The supporting units II and I 2 will be grasped to the clamping members30, 39 after said clamping members have been gripped against oppositelydisposed surfaces of a device or article a bearing of which is to berebored. Fluid under pressure for actuating the pistons 41, 41 isapplied to the space 48 of the cylinders 46 by way of the connectorsIIB, thehollow interiors ofthe pushrods ID, the ports I and I2I in thestub ends II 8, the compartments I30, the ports I28 in the clampingplugs I22, the chambers I II] and the ports 49. The self-aliningbearings I4 and ,I5'will permit rocking movement of the supporting unitsII and I2 in universal direction relativeto said seli-alinin bearingsduring the operation of lockingsaid supporting units to said clampingmembers, so that securing the supporting units up againstthe clampingmembers will have no tendency toward displacing the set relation of saidclamping members with respect to a retained device, article or piston.And, too, the supporting unit- I2 is pulled toward the supporting unit-II in direction longitudinally of the locating rod or mandrel so thatthere is no tendency toward disalinement.

I The locking elements 36 and 37 will be actuated in response to fluidunder pressure to cause the supporting units II and I2 to be engagedagainst the-clamping members 30, with equal pressure. r

. Pressure of fluid in the spaces 48 of the cylinders 46 and in thespace 88 of the cylinder 15 will be relieved when a device or article isto be removed from the machine, and another device or article thebearing of which is to be rebored can be located in the machine byrepetition of the operations hereinbefore described.

In an instance when a device, article or piston having a bearing to berebored is of shape other than flat at onev of its ends, as for instancewhen a piston has an irregularly shaped closed end, the machine canincorporate special means for supporting the device, article or piston.As disclosed, one of theclamping members 30 detachably sup- 12 ports, asat I3I, a disc element I32 disposed for} wardly of and in spacedrelation to the fiat in terior surface 3i. disc element is cut away tobe in clearing relation to the corresponding clamping plug I22, and thebody of the disc element retains, through the instrumentality of clipsI34, spacing screws I33. The heads of the spacing screws are situatedbe.- tween the disc element and the clamping member .and the bodies ofsaid spacing screws terminate in unequally spaced relation to saidclamping member. In an instance when employed, the

spacing screws I33 will engage the device, article or piston to berebored, in lieu of the flat interior surface 3 I.

It will be understood of course that the locat{ ing rod or mandrel, suchas I5, will be removed from a device or article having a bearing to berebored after said device or article is set up in the machine, and aboring bar with appropriate cutting tool will be set up in the bearingsof the supporting units II and I2 and actuated to accomplish a reboringoperation upon the bearing of the device or article.

What is claimed is:

1. In a machine for centering and alinlng with respect to each other thebearing of an article to be rebored and a boring bar with appropriatetool for reboring said bearing, a frame, spaced apart supporting unitsmounted on said frame for movement toward and away from each other,alined bearings upon said supporting units,'respectively, adapted toremovably receive a boring bar locating element for insertion throughthe bearing of said article while situated between said supportingunits, spaced apart clamping units between and slidably assembled withsaid supporting units mounted for movement toward and against saidoppositely disposed surfaces of said 7 article and the supporting unitsengaged against opposed surfaces of each of the clamping units.

2. In a machine for centering and alining with respect to each other thebearing of an article" to be rebored and a boring bar with appropriatetool for reboring said bearing, a frame, spaced apart supporting unitsmounted on said frame for movement toward and away from each other,alined bearings upon said supporting units, re? spectively, adapted toremovably receive a boring bar'locating element for insertion throughthe bearing of said article while situated between said supportingunits, spaced apart clamping units between and slidably assembled withsaid supporting units mounted for movement toward and away from eachother in direction transversely of the direction in which saidsupporting units are capable of movement, means for actuating saidclamping units into releasably engaged relation with oppositely disposedsurfaces of said article while the article is upon said locating elementin spaced relation to said supporting units, means for releasablysecuring said supporting units and clamping units in fixed relation toeach other with the clamping units engaged against said oppositelydisposed surfaces of said The central portion of said article and thesupporting units engaged against opposed surfaces of each of theclamping units, and means for releasably securing said supporting unitsin fixed relation to said frame.

3. In a machine for centering and alining with respect to each other thebearing of an article to be rebored and a boring bar with appropriatetool for reboring said bearing, a frame, spaced apart, parallelsupporting units mounted on said frame for movement toward and away fromeach other, alined self-alining bearings upon said supporting units,respectively, adapted to removably receive a boring bar locating elementfor insertion through the bearing of said article while situated betweensaid supporting units, spaced apart, parallel clamping members between,slidably assembled with and perpendicular to said supporting unitsmounted for movement toward and away from each other in directiontransversely of the direction in which said supporting units are capableof movement, means for actuating said clamping members into releasablyengaged relation with oppositely disposed surfaces of said article whilethe article is upon said 10- cating element in spaced relation to saidsupporting units, and means for releasably securing said supportingunits and clamping members in fixed relation to each other with theclamping members engaged against said oppositely disposed surfaces ofsaid article .and the supporting units engaged against opposed surfacesof each of said clamping members.

4. In a machine for centering and alining with respect to each other thebearing of an article to be rebored and a boring bar with appropriatetool for reboring said bearing, a frame, spaced apart, parallelsupporting units mounted on said frame for movement toward and away fromeach other, alined self-alining bearings upon said supporting units,respectively, adapted to removably receive a boring bar locating elementfor insertion through the bearing of said article while situated betweensaid supporting units, spaced apart, parallel clamping members between,slidably assembled with and perpendicular to said supporting unitsmounted for universal rocking movement and for movement toward and awayfrom each other in direction transversely of the direction in which saidsupporting units are capable of movement, means for actuating saidclamping members into releasably engaged relation with oppositelydisposed surfaces of said article while the article is upon saidlocating element in spaced relation to said supporting units, and meansfor releasably securing said supporting units and clamping members infixed relation to each other with the supporting units engaged againstopposed surfaces of each of the clamping members.

5. In a machine for centering and alining with respect to each other thebearing of an article .to be rebored and a boring bar with appropriatetool for reboring said bearing, a frame, spaced apart, parallelsupporting units mounted on said frame for movement toward and away fromeach other, alined self-alining bearings upon said supporting units,respectively, adapted to removably receive a boring bar locating elementfor insertion through the bearing of said article while situated betweensaid supporting units, spaced apart, parallel clamping members betweenand perpendicular to said supporting units mounted upon the supportingunits for movement toward and away from each other in directiontransversely of the direction in which said supporting units are capableof. movement, means for actuating said clamping members into releasablyengaged relation with oppositely disposed surfaces of said article whilethe article is upon said locating element in spaced relation to saidsupporting units, and means for releasably securing said supportingunits and clamping members in fixed relation to each other with theclamping members engaged against said oppositely disposed surfaces ofsaid article and the supporting units engaged against oppositelydisposed surfaces of each of said clamping-members.

6. In a machine for centering and alining with respect to each other thebearing of an article to be rebored and a boring bar with appropriatetool for reboring said bearing, a frame, spaced apart, parallelsupporting units mounted on said frame for movement toward and away fromeach other, alined self-alining bearings upon said supporting units,respectively, adapted to removably receive a boring bar locating elementfor insertion through the bearing of said article while situated betweensaid supporting units, spaced apart, parallel clamping members betweenand perpendicular to said supporting units mounted for universal rockingmovement and for movement toward and away from each other in directiontransversely of the direction in which said supporting units are capableof movement, means for actuating said clamping members into releasablyengaged relation with oppositely disposed surfaces of said article whilethe article is upon said locating element in spaced relation to saidsupporting units, means for releasably securing said supporting unitsand clamping members in fixed relation to each other with the clampingmembers engaged against said oppositely disposed surfaces of saidarticle and the supporting units engaged against oppositely disposedsurfaces of said clamping members, and means for releasably securing atleast one of each of said supporting units in fixed relation to saidframe.

'7. In a machine for centering and alining with respect to each. otherthe bearing of an article to be rebored and a boring bar withappropriate tool for reboring said bearing, a frame, spaced apartsupporting units mounted on said frame for movement toward and away fromeach other, alined bearings upon said supporting units, respectively,adapted to removably receive a boring bar locating element for insertionthrough the bearing of said article while situated between saidsupporting units, spaced apart clamping units between said supportingunits mounted for movement toward and away from each other in directiontransversely of the direction in which said supporting units are capableof movement, hydraulic means for actuating said clamping units intoreleasably engaged relation with oppositely disposed surfaces of saidarticle while the article is upon said locating element in spacedrelation to said supporting units, hydraulic means for releasablysecuring said supporting units and clamping units in fixed relation toeach other with the supporting units engaged against opposed surfaces ofeach of the clamping units, and means for releasably securing saidsupporting units and clamping units to said frame.

8. In a machine for centering and alining with respect to each other thebearing of an article to be rebored and a boring bar with appropriatetool for reboring said bearing, a frame, spaced apart, parallelsupporting units mounted on said frame for movement toward and away fromeach other, alined self-alining bearings upon said supporting units,respectively, adapted to removably receive a boring bar locating elementfor inser- '15 tion through the bearing of said article while situatedbetween said supporting units, spaced apart, parallel clamping membersbetween and perpendicular to said supporting units mounted for universalrocking movement and for movement toward and away from each other indirection transversely of the direction in which said supporting unitsare capable of movement, hydraulic means for actuating said clampingmembers into releasably engaged relation with oppositely disposedsurfaces of said article while the article is upon said locating elementin spaced relation to said supporting units, hydraulic means forreleasably securing said supporting units and clamping members in fixedrelation to each other with the supporting units engaged against opposedsurfaces of each of the clamping members,

and hydraulic means for releasably securing said supporting units andclamping members in fixed relation to said frame.

9. In a machine for centering and alining with I respect to each otherthe bearing of an article to be rebored and a boring bar withappropriate tool for reboring said bearing, a frame, spaced apartsupporting units mounted on said frame for movement toward and away fromeach other, alined self-alining bearings upon said supporting units,respectively, adapted to removably receive a boring bar locating elementfor insertion through the bearing of said article while situated betweensaid supporting units, spaced apart clamping units between and upon saidsupporting units mounted for universal rocking movement and for movementtoward and away from each other in direction transversely of thedirection in which said supporting units are capable of movement, meansfor actuating said clamping units toward each other into releasablyengaged relation with oppositely disposed surfaces of said article whilethe article is upon said locating ele ment in spaced relation to saidframe and said supporting units, and means for releasably securing saidsupporting units and clamping units in fixed relation to each other withthe supporting units engaged against opposed surfaces of each of theclamping units.

10. In a machine for centering and alining with respect to each otherthe bearing of .an article to be rebored and a boring bar withappropriate tool for reboring said bearing, a frame, spaced apartsupporting units mounted on said frame for movement toward and away fromeach other, alined self-alining bearings upon said supporting units,respectively, adapted to removably re-' ceive a boring bar locatingelement for insertion through the bearing of said article While situatedbetween said supporting units, spaced apart clamping units between andupon said supporting units mounted for universal rocking movement andfor movement toward and away from each other in direction transverselyof the direction in which said supporting units are capable of movement,hydraulic means for actuating said clamping units toward each other intoreleasably engaged relation with oppositely disposed surfaces of saidarticle while the article is upon said locating element in spacedrelation to said frame and said supporting units, hydraulic means forreleasably securing said supporting units and clamping units in fixedrelation to each other with the supporting units engaged against opposedsurfaces of each of the clamping units, and means for anchoring saidsupporting units and clamping units to said frame.

11. In a machine of the character described, a frame, supporting unitsmounted on said frame for movement toward and away from each others, aclamping member between said supporting units, locking elements uponsaid clamping member in opposed relation to each other and havin outerportions thereof situated at oppositesides of the clamping member andslidably disposed in longitudinally extending slots in said supportingunits, resilient means normally retaining said locking elements inreleased engagement relative to said supporting units, and means foractuating said locking elements against force of said resilient means tocause said supporting units to. be fixedly secured to and against saidclamping member.

12. In a machine of the character described, a frame, supporting unitsmounted on said frame for movement toward and away from each other andhaving longitudinally extending T-slots, a clamping member between saidsupporting units, locking elements in alined relation upon said clampingmember and having outer portions thereof slidably disposed in saidlongitudinally extending T-slots, resilient means between and normallyurging said locking elements apart and in released engagement relativeto said supporting units, a cylinder upon said clamping member, spacedapart pistons in said cylinder, and actue ating levers havingintermediate portions thereof pivoted upon said clamping member, firstend portions thereof engaged with said locking elements and second endportions thereof engaged against outer end portions'of said pistons,there being a space in said cylinder for receiving fluid under pressureadapted to cause said pistons to be forcibly moved apart thus to operatesaid actuating levers to forcibly move said locking elements toward eachother to cause said supporting units to be fixedly secured to andagainstsaid clamping member.

13. In a machine of the character described; a clamping member having achamber, 'a-gpushrod secured to said clamping member and having aninternal passageway contiguous with said chamber, a cylinder upon saidclamping member,..and spaced apart pistons in said cylinder, there beinga space in said cylinder for receiving fluid under pressure adapted tocause said pistons tobe forcibly moved apart, and there being a portbetween said chamber and space for' passage of fluid under pressure fromthe internal passageway of said pushrod and said chamber into saidspace.

14. In a machine of the character described, clamping members in spacedapart,. alined'relation having interior surfaces situated opposed,substantially parallel relation, alined pushrods extending exteriorlyfrom said clamping members, respectively, at the exterior sides thereof,clamping plugs in said clamping members at the interior sides thereof inoverlapping relation to said pushrods and constituting 'means formounting the clamping members upon the pushrods for universal rockingmovement, means each constituted as an exterior and an interior collarsecuring said clamping members upon said pushrods for rocking movementof the clamping members in a horizontal plane and precluding relativemovement of the pushrods and 'said clamping members in a vertical plane,and a resilient member normally urging the exterior and interior collarsof each of said clamping members into engaged relation, movement of saidpushrods in longitudinal direction toward said clamping members beingadapted to release said interior collars from said exterior collarsagainst the ac-- tion of said resilient members thus to cause theclamping plugs to constitute means mounting the clamping members uponthe pushrods for universal rocking movement.

15. In a machine of the character described, a frame, spaced apartsupporting units mounted on said frame for movement toward and away fromeach other, alined bearings upon said supporting units to removablyreceive a boring bar locating element for insertion through the bearingof an article to be bored, spaced apart clamping units between saidsupporting units mounted for movement toward and away from each other indirection transversely of the direction in which said supporting unitsare capable of movement to be releasably engaged against opposedsurfaces of said article while upon said locating element in spacedrelation to said supporting units, and means assembled directly with thesupporting units and clamping units for releasably securing saidsupporting units against opposite surfaces of each of said clampingunits while engaged against said article and in fixed relation to saidframe.

16. The combination as specified in claim wherein said clamping unitsare mounted for uni versal rocking movement.

17. The combination as specified in claim 15 wherein said clamping unitsare mounted upon said supporting units for universal rocking movement.

18. The combination as specified in claim 15 wherein said means includeslocking elements upon each of said clamping units disposed in slots ineach of said supporting units.

19. In a machine of the character described, a frame, spaced apartoperating levers having intermediate portions thereof mounted on saidframe for swinging movement of first and second arms, respectively, ofsaid operating levers toward and away from each other, means forforcibly moving the second arms of said operating levers in directionaway from each other thus to move the first arms of said operatinglevers toward each other, alined pushrods having intermediate portionsthereof assembled with the first arms of the operating levers forlongitudinal adjustment of the pushrods in the plane of swingingmovement of said first arms and for rocking movement of said pushrods,and spaced clamping 18 members supported upon said pushrods in alinedrelation therewith and disposed between the first arms of said operatinglevers.

20. The combination as specified in claim 19, means securing each ofsaid pushrods to its corresponding clamping member, and means for accomplishing longitudinal adjustment of said pushrods constituted as anexternal thread on each pushrod and an actuator nut on each externalthread rotatably assembled with one of said first arms.

21. In a machine of the character described, a frame, supporting unitsmounted on said frame for movement toward and away from each other, aclamping member between said supporting units, locking elements uponsaid clamping member in opposed relation to each other and having outerportions thereof situated at opposite sides of the clamping member anddisposed in longitudinally extending slots in said supporting units,resilient means normally retaining said locking elements in releasedengagement relative to said supporting units, and means for actuatingsaid locking elements toward said clamping member against force of saidresilient means to cause the supporting units to be fixedly securedagainst opposed surfaces of the clamping member.

EWALD A. ARP.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number. Name Date 1,462,742 Davis et al July 24,1923 1,582,639 Cullen Apr. 27, 1926 1,589,085 Andersen et al. June 15,1926 1,751,708 Neller Mar. 25, 1930 1,896,059 Wainwright Jan. 31, 19831,898,285 Blauvelt Feb. 27, 1933 2,011,877 Shafi Aug. 20, 1935 2,129,485Zimmerman Sept. 6, 1938 2,162,133 Spire June 13, 1939 2,248,998 Johnsonet a1. July 15, 1941 2,290,106 Longstreet July 14, 1942 2,341,602 DeweyFeb. 15, 1944 2,389,526 Maulding Nov. 20, 1945

